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 Post subject: 06 crf250R runs but hard to start when cold
PostPosted: Tue Oct 11, 2011 8:25 pm 
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Joined: Sun Feb 17, 2008 6:08 pm
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Location: Flowery Branch
I'm having problems starting the bike for the first time when we get to the track. We finally got it to start by "push starting". After we got the bike running it started OK the rest of the day. The bike ran good with no problems the rest of the day.

Tonight we decided to check the valves. Both exhaust valves are about .001" tight on the clearance and the both intake valves are about .001" tight.

Question... Would this cause it not to start when it's cold with the kick starter?

Ideas?
BeRyan


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 Post subject: Re: 06 crf250R runs but hard to start when cold
PostPosted: Tue Oct 11, 2011 8:50 pm 
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Joined: Mon Sep 07, 2009 4:46 pm
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Location: Hoschton, Ga.
::duh:: Been there done that!

Congrats on the new bike but..... You might miss the 1-2-5

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2 Strokes..... Just like golf, fewer strokes are a good thing!

06 CRF250R- Sold (No more 4Joke)
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 Post subject: Re: 06 crf250R runs but hard to start when cold
PostPosted: Tue Oct 11, 2011 8:58 pm 
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I have two hondas a 2006 and a 2012. I check my valves pretty regularly. When the bike starts getting hard to start and you loose compresson most likely your valves need to be adjusted. ALL honda 4 strokes are cold natured thats just a fact. Other than that, they are SOLID bikes. Wont catch me on anything else :D

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 Post subject: Re: 06 crf250R runs but hard to start when cold
PostPosted: Tue Oct 11, 2011 9:10 pm 
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Joined: Sun Feb 17, 2008 6:08 pm
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Location: Flowery Branch
yes, that yz 125 was the best bike we have owned. Bullet proof! Never once let us down.
We just have replaced the yz with a cr250 smoker (great deal could not turn down). First ride was sunday at Monroe and it is scary fast.

We have had this 4 stroke bike for a while. It has been problem free until sunday.

BeRyan


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 Post subject: Re: 06 crf250R runs but hard to start when cold
PostPosted: Tue Oct 11, 2011 9:27 pm 
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Just as Trey mentioned..... Hondas are Stout bike.
Put many hrs on mine before experiencing same problem as yours and rebuild was needed and traded for the 2502t. If Honda still made 2t's I'd probably still be on Red.

It seems everyone says they are a little harder on valves than other brands but other than that practiacally problem free. Stainless Steel Valves are said to be the way to go ::up::

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2 Strokes..... Just like golf, fewer strokes are a good thing!

06 CRF250R- Sold (No more 4Joke)
01 KX125
09 YZ250


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 Post subject: Re: 06 crf250R runs but hard to start when cold
PostPosted: Tue Oct 11, 2011 9:48 pm 
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You are wasting your time with any jetting. The intake valves are toast. You can shim them, but they will zero again with in 1-5 hours. Pull the head and replace the intakes, shim the exhausts after you check the exhaust guides and seats, but the exhausts are usually fine.

The intakes are ti., like most 4strike valves. But once they move and definitely when they zero shimming just gets you a ride or two. I speak from experience.

You must always clean your air filter and change your oil on the 250 Honda's. Also check the seal where the carb boot connects to the air box, its not a bad idea to pull it and silicone it. Sand destroys the coating on the ti valves, causing them to wear very fast.

An alternative is ss intakes but that will rob a little rev and rpms. The stainless valves can have a longer service life. Or send the head to fastheads and have the seats replaced with byrlliam(sp)copper seats and ti valves.

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 Post subject: Re: 06 crf250R runs but hard to start when cold
PostPosted: Wed Oct 12, 2011 6:19 am 
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If the valves are only .001" from spec that is not the problem. My experience with Honda CRF250's is that they will start fine up until you get to zero clearance. Honda bikes are very cold natured from the factory. My son's 2009 model is the same way. What we do that seems to work well is pump the throttle fully about 4-5 times before kicking it. With the choke on it will usually hit in one to two kicks. It make take a couple of times doing this to get it started but it works. The real problem is the jetting and fuel screw adjustment. They are very lean from the factory which makes cold starts difficult.

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 Post subject: Re: 06 crf250R runs but hard to start when cold
PostPosted: Wed Oct 12, 2011 6:47 am 
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BamaGreg wrote:
If the valves are only .001" from spec that is not the problem.


+1 on what Greg said. The valves may be a problem soon, a known Honda issue, but .001 off spec is not the cause for hard starting at the moment.

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 Post subject: Re: 06 crf250R runs but hard to start when cold
PostPosted: Wed Oct 12, 2011 7:06 am 
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.001 and.001 from spec would be totally different measures. The intakes are .005-.007. So 004 or 001? Btw, run your exhausts at exactly. 009 not the 011+/-001, you'll get a little extra.

Typically the 250's are close, and if anything rich. 42 or 45 pilot, wire your AP, 55 leak jet. Your main will be around 170-175. Needle on the 3rd clip.The 06 was the first year for the 40mm carb, Honda didn't sort it out till 08. The starting problems with the little 4stroke is usually user error. But they can be jet finicky. Start at 2 turns out on your mixture screw.

Have you pulled the carb and looked in it? What's your jetting, float level etc? I just rejected one that some moron completely screwed. If your local, I'd be glad to help ya sort it out.

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 Post subject: Re: 06 crf250R runs but hard to start when cold
PostPosted: Wed Oct 12, 2011 7:10 am 
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Location: Conyers, GA
BeRyan wrote:
Both exhaust valves are about .001" tight on the clearance and the both intake valves are about .001" tight.


I'm thinking he means they are at .004.

But I agree, the weather recently made a drastic change in temperature. Get the jetting sorted out ::cheers::

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 Post subject: Re: 06 crf250R runs but hard to start when cold
PostPosted: Mon Oct 31, 2011 12:09 pm 
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Joined: Sun Feb 17, 2008 6:08 pm
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Location: Flowery Branch
Thanks for all the help.

Come to find out I somehow measured the valves wrong.
"robfromGA" was correct... intake valves were Toast. Replaced valves all is good now.
Spent the day yesterday at AMP and the bike ran great.

Problem now is that the he rode a 250 2 stroke at AMP yesterday and said that it was alot easier to get over the big jump on it than the 4 stroke. no need to explain. Bike will most likely be for sale this week.
BeRyan


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 Post subject: Re: 06 crf250R runs but hard to start when cold
PostPosted: Wed Dec 07, 2011 3:41 pm 
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It's great to see 2 strokes slowly making a comeback . Last weekend a dude on a tm125 was spanking everything on the track in the open and schoolboy classes . We tend to forget 2t's made motocross what it is today ::up::

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1991 Cr125 (fiancees)
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1987 Cr125 (sold)
1988 Kx250 (sold)
1991 Kx250 (sold)
1998 Kx250 (sold)


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